Experimental and Numerical Analysis of Heat Transfer from a Round Jet Impinging on an Asymmetric Concave Surface

The experimental and numerical studies has been performed to investigate the flow and heat transfer from a round jet impingement to asymmetry concave surface. For this purpose, an asymmetric cylindrical surface with curvature radiuses of 8 and 12 cm, 8 and 24 cm has been considered. A silicon rubber heater applied uniform heat flux of 2000 W/m2 on the target plate. The different point temperature of the surface has been evaluated by an IR camera. The asymmetric distribution of Nusselt number is compared with two symmetrical concave surfaces with curvature radiuses of the 8, 12 and 24 cm. In this study, the effects of relative curvature, Reynolds number, and jet to surface distance on Nusselt number distribution are investigated. The study of asymmetric flow and heat transfer in symmetric and asymmetry surfaces has been carried out for three Reynolds numbers of 23,000, 35,000 and 50,000 and two jet-to-plate distance (H/d) of 2 and 4. Results show that the concave surface with the radius of 8 cm has more values of Nusselt number compared to the surfaces with the curvature radius of 12 and 24 cm. Also, by reducing the distance of jet from the target plate the Nusselt number increases across the asymmetric concave surface.